CN104122037A - Method for detecting internal leakage of gas valve of industrial furnace online by utilizing furnace temperature change - Google Patents
Method for detecting internal leakage of gas valve of industrial furnace online by utilizing furnace temperature change Download PDFInfo
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- CN104122037A CN104122037A CN201310153787.0A CN201310153787A CN104122037A CN 104122037 A CN104122037 A CN 104122037A CN 201310153787 A CN201310153787 A CN 201310153787A CN 104122037 A CN104122037 A CN 104122037A
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Abstract
Provided is a method for detecting internal leakage of a gas valve of an industrial furnace online by utilizing furnace temperature change. The industrial furnace comprises a pressure regulating valve arranged on a blower fan header pipe and a plurality of burner nozzles, wherein each burner nozzle is provided with a gas valve, an air valve and a flame detector. The detection method comprises the following steps: 1) dividing the burner nozzles into a plurality of areas under detection; 2) collecting the temperature of the areas under detection; 3) carrying out A/D conversion on signals obtained from the areas under detection; 4) reading, calculating and displaying a changing curve of the temperature signals of the areas under detection; 5) comparing the temperature variation curve detected actually with the preset temperature curve, judging the areas under detection which have internal leakage phenomenon, and sending a leakage alarming signal; and 6) opening the air valve, and if detecting burner nozzle flame through the flame detector, sending an alarming signal. According to the method for detecting the internal leakage of the gas valve of the industrial furnace online by utilizing the furnace temperature change, online detection of the internal leakage of the gas valve can be realized, small-flow internal leakage can be found quickly, and loss is thus reduced.
Description
Technical field
The present invention relates to production technology detection field, be specifically related to a kind of furnace temperature of utilizing and change the online method that detects the internal leakage of industrial furnace gas valve.
Background technology
Internal leakage for valve detects, generally adopt at present after equipment out of use or replacing, to being filled with in pipeline after the nitrogen or other inert gases of certain pressure, if stable or pressure drop is within can accepting limit in a period of time internal pressure, judge that acceptable offline mode carries out.
Application number is that 201010614664.9 invention relates to a kind of fuel gas leakage detection method, comprise the steps: that (1) open the combustion gas main road solenoid valve of gas shock wave soot-blowing system, close detected combustion gas and divide the first solenoid valve of branch road, to fuel gas pipeline, inflate; (2) whether in allowed limits the leakage signal value detecting according to the signal measurement apparatus on combustion gas main road, judges whether the fuel gas pipeline between combustion gas main road electromagnetic valve outlet to the first electromagnetic valve entrance exists gas leakage; (3) according to step (1), (2), next combustion gas branch road is detected.But this invention is not suitable for online detection.
Summary of the invention
For overcoming the above problems, the object of the present invention is to provide a kind of a kind of furnace temperature of utilizing of on-line monitoring valve leakage to change the online method that detects the internal leakage of industrial furnace gas valve.
A kind of technical scheme of utilizing furnace temperature to change the method that detects online the internal leakage of industrial furnace gas valve of the present invention is as follows:
A kind of furnace temperature of utilizing changes the online method that detects the internal leakage of industrial furnace gas valve, described industrial furnace comprises the pressure-regulating valve being arranged on blower fan house steward, some burners, each burner is provided with gas valve, air valve and flame detector, it is characterized in that, described detection method comprises the steps:
(1) described burner is divided into several tested regions, each tested region at least comprises two burners;
(2) use sensor according to default sampling interval time, to gather the temperature in tested region, obtain the simulating signal of each region dut temperature situation of change of statement;
(3) simulating signal of each tested region being obtained is carried out A/D conversion, forms corresponding digital signal and is stored into memory storage;
(4) digital signal in each tested region that read storage device stores, calculates and passes through graphics device, shows respectively the temperature variation curve of each tested regional temperature signal;
(5) temperature variation curve reality being detected and the temperature curve of setting contrast, if tested regional temperature change curve presents one-sided distribution with respect to the temperature variation curve N continuous of a setting point, judge that this tested region exists internal leakage phenomenon, sends leakage alarm signal;
(6) open air valve, by flame detector, detect burner flame, at described flame detector, detect after burner flame, send alerting signal.
According to a kind of method that changes the internal leakage of online detection industrial furnace gas valve by furnace temperature of the present invention, it is characterized in that, described N value is 6～8, described sampling interval time is set as 7～9 seconds, if all one-sided distributions of continuous 6～8 points of temperature curve, judge that tested region exists internal leakage phenomenon.
According to a kind of method that changes the internal leakage of online detection industrial furnace gas valve by furnace temperature of the present invention, it is characterized in that described two burners of each tested district inclusion.
According to a kind of method that changes the internal leakage of online detection industrial furnace gas valve by furnace temperature of the present invention, it is characterized in that, before opening air valve, first regulate the aperture of the pressure-regulating valve on blower fan house steward.
A kind of furnace temperature of utilizing according to the present invention changes the online method that detects the internal leakage of industrial furnace gas valve, it is characterized in that, the regulation of the pressure-regulating valve on described blower fan house steward is 20%～40%.
The invention has the beneficial effects as follows:
A kind of furnace temperature of utilizing provided by the invention changes the online method that detects the internal leakage of industrial furnace gas valve, can be by detecting online the existence of finding fast low discharge internal leakage.Adopt the method operation operation of detection industrial furnace gas valve of the present invention internal leakage easy, cost-saving.
Accompanying drawing explanation
Fig. 1 is internal leakage condition judgement schematic diagram;
Fig. 2 is that schematic diagram is divided in region;
Fig. 3 is the process flow diagram of detection method.
In Fig. 1: top is for dispersing temperature curve, and below is sustained oscillation convergence curve, and SP represents temperature curve setting value, and PV represents temperature curve actual value; In Fig. 2: 1# to 12# is burner, A1 to A6 is master control region; In Fig. 3: DT-flag is model constant temperature, cooling zone bit, and Area-ID is control area identification code; T-PV-[Area-ID] be the temperature actual value of corresponding control area, T-SP-[Area-ID] be the desired temperature of corresponding control area, Area-flag[Area-ID] be internal leakage warning mark position, corresponding region,
Air-valve-deg-SP is air door opening value.
Embodiment
Below in conjunction with drawings and Examples, a kind of method of utilizing furnace temperature to change the internal leakage of online detection industrial furnace gas valve of the present invention is further described.
Below in conjunction with drawings and Examples, a kind of method of utilizing furnace temperature to change the internal leakage of online detection industrial furnace gas valve of the present invention is further described.
First set forth and select temperature as follows as reason and the abnormality juding rule of indirect judgement amount: normal flame, due to injection and the beating action of combustion air, can form obvious bar-shaped long flame, and near causing the thermopair on furnace wall, opposite, temperature raises; And coal gas internal leakage is generally less, different from the temperature rise that normal injection flame causes, near its only dispersivity burning burner, without obvious flame.Only can cause the temperature of burner near zone to raise.The temperature variation distinguishing characteristic that both cause is obvious, and therefore, selecting it is to vector.This,, by monitoring temperature curve, just can effectively identify; Because Heating Steel Ingots technique is divided into intensification, insulation, cooling three phases by furnace temperature curve.Wherein in the temperature rise period, valve, all in open mode, therefore cannot distinguish whether there is internal leakage, and internal leakage has no adverse effects to burning, so decision model only drops at insulation and temperature-fall period, by the temperature curve under insulation and temperature descending section normal condition, carrying out local amplification can find, actual value PV be take setting value SP as axis of symmetry, be sinusoidal wave mode, wait accessory shock to swing curve (as shown in Figure 1), the temperature curve that internal leakage causes presents divergent trend (as shown in Figure 1), therefore, for effectively distinguishing both, the X that desired temperature SP is regarded as to SPC instrument X-R figure in statistics, the R that the actual value PV of temperature is regarded as to X-R figure, regulation: if within a period of time, N continuous all one-sided distributions of point, judge this process exception, and then trigger corresponding prevention mechanism, standard is as follows:
A: on figure, N continuous point appears at a side of Control Centre's line;
B: on figure, N continuous point occurs that the regularity that continues to rise or decline changes.
Consider valve event time and promptness, get N=7 herein, sample interval is 8 seconds, if all one-sided distributions of continuous 7 points of temperature curve, judgement abnormal (as shown in Figure 1).
Principle of work is as follows: as shown in Figure 2, first by region refinement, burner is carried out to region division, and preferably, every two burners are divided into a region, each burner is furnished with independently a pair of air and gas valve, be installed in before burner on combustion air and gas entry pipeline, determine the corresponding relation of burner and detector unit described in burnt gas valve, wherein A1 region is comprised of 1#, 3# burner and 1# temperature-control heat couple T1, the rest may be inferred, is divided into altogether 6 master control regions.As shown in Figure 3, when temperature-fall period zone bit DT-flag=1, start internal leakage scan round determining program functional block, cycle detection is carried out in 6 master control regions, once meet aforesaid abnormal judgment rule, judge that the burner in corresponding region exists internal leakage (as shown in Figure 3), flame detector and air valve are installed on each burner, preferably choose ultraviolet flame detector, when detecting and sending warning by temperature-control heat couple, manually by air blower entrance house steward pressure-regulating valve regulation 20%～40%, preferably be adjusted in 30% left and right (according to the blower fan pumping point aperture of each different manufacturers difference to some extent, object is to prevent that blast is excessive, once fire can be blown out after opening the air-valve of corresponding burner in alarm region), then control system is sent the air valve (gas valve is still in closed condition) that instruction is performed fighting before burner, appropriate air makes to reveal gas-fired flame and presents the column flame that ultraviolet flame detector can effectively be identified, can determine like this that gas valve that in region specifically, which burner is corresponding exists leaks.Flame detector detects after flame existence, send signal feedback to I/O module corresponding in control system, in system, corresponding item is assigned effectively like this, program scanning is carried out corresponding sound and light alarm subroutine after item state, then takes corresponding measure, and arm front end hand off valve is closed at scene, then screw off four hex bolts, disintegration valve, checks inner case, changes impaired parts.
A kind of furnace temperature of utilizing of the present invention changes the online method that detects the internal leakage of industrial furnace gas valve, can be by detecting online the existence of finding fast low discharge internal leakage.Adopt the method operation operation of detection industrial furnace gas valve of the present invention internal leakage easy, cost-saving.
Claims (5)
1. one kind is utilized furnace temperature to change the online method that detects the internal leakage of industrial furnace gas valve, described industrial furnace comprises the pressure-regulating valve being arranged on blower fan house steward, some burners, each burner is provided with gas valve, air valve and flame detector, it is characterized in that, described detection method comprises the steps:
(1) described burner is divided into several tested regions, each tested region at least comprises two burners;
(2) use sensor according to default sampling interval time, to gather the temperature in tested region, obtain the simulating signal of each region dut temperature situation of change of statement;
(3) simulating signal of each tested region being obtained is carried out A/D conversion, forms corresponding digital signal and is stored into memory storage;
(4) digital signal in each tested region that read storage device stores, calculates and passes through graphics device, shows respectively the temperature variation curve of each tested regional temperature signal;
(5) temperature variation curve reality being detected and the temperature curve of setting contrast, if tested regional temperature change curve presents one-sided distribution with respect to the temperature variation curve N continuous of a setting point, judge that this tested region exists internal leakage phenomenon, sends leakage alarm signal;
(6) open air valve, by flame detector, detect burner flame, at described flame detector, detect after burner flame, send alerting signal.
2. according to claim 1 a kind of by the online method that detects the internal leakage of industrial furnace gas valve of furnace temperature variation, it is characterized in that, described N value is 6～8, described sampling interval time is set as 7～9 seconds, if all one-sided distributions of continuous 6～8 points of temperature curve, judge that tested region exists internal leakage phenomenon.
3. a kind of method that changes the internal leakage of online detection industrial furnace gas valve by furnace temperature according to claim 1, is characterized in that described two burners of each tested district inclusion.
4. a kind of method that changes the internal leakage of online detection industrial furnace gas valve by furnace temperature according to claim 1, is characterized in that, before opening air valve, first regulates the aperture of the pressure-regulating valve on blower fan house steward.
5. a kind of furnace temperature of utilizing according to claim 4 changes the online method that detects the internal leakage of industrial furnace gas valve, it is characterized in that, the regulation of the pressure-regulating valve on described blower fan house steward is 20%～40%.
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| CN201310153787.0A CN104122037B (en) | 2013-04-28 | 2013-04-28 | A kind of method utilizing furnace temperature change on-line checking industrial furnace gas valve internal leakage |
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| CN201310153787.0A CN104122037B (en) | 2013-04-28 | 2013-04-28 | A kind of method utilizing furnace temperature change on-line checking industrial furnace gas valve internal leakage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413049A (en) * | 2020-03-04 | 2020-07-14 | 首钢京唐钢铁联合有限责任公司 | Method and device for detecting leakage of heating furnace burner quick-cutting valve |
| CN112394011A (en) * | 2020-10-26 | 2021-02-23 | 广西投资集团北海发电有限公司 | Coal mill coal powder fineness monitoring device and automatic adjusting method |
| CN113916453A (en) * | 2021-10-15 | 2022-01-11 | 晋能控股装备制造集团华昱能源化工山西有限责任公司 | Method for rapidly finding leakage and locking leakage valve |
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| US7707870B2 (en) * | 2007-07-16 | 2010-05-04 | Chrysler Group Llc | Method and apparatus for oil leak testing |
| CN101922993A (en) * | 2009-06-15 | 2010-12-22 | 宝山钢铁股份有限公司 | On-line real-time monitoring hearth sealability early-warning device and early-warning method |
| CN102141459A (en) * | 2010-12-30 | 2011-08-03 | 北京光华纺织集团有限公司 | Fuel gas leakage detection method |
| JP2012057981A (en) * | 2010-09-06 | 2012-03-22 | Trinity Industrial Co Ltd | Odor detection system for painting facility |
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2013
- 2013-04-28 CN CN201310153787.0A patent/CN104122037B/en active Active
Patent Citations (4)
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| US7707870B2 (en) * | 2007-07-16 | 2010-05-04 | Chrysler Group Llc | Method and apparatus for oil leak testing |
| CN101922993A (en) * | 2009-06-15 | 2010-12-22 | 宝山钢铁股份有限公司 | On-line real-time monitoring hearth sealability early-warning device and early-warning method |
| JP2012057981A (en) * | 2010-09-06 | 2012-03-22 | Trinity Industrial Co Ltd | Odor detection system for painting facility |
| CN102141459A (en) * | 2010-12-30 | 2011-08-03 | 北京光华纺织集团有限公司 | Fuel gas leakage detection method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111413049A (en) * | 2020-03-04 | 2020-07-14 | 首钢京唐钢铁联合有限责任公司 | Method and device for detecting leakage of heating furnace burner quick-cutting valve |
| CN112394011A (en) * | 2020-10-26 | 2021-02-23 | 广西投资集团北海发电有限公司 | Coal mill coal powder fineness monitoring device and automatic adjusting method |
| CN113916453A (en) * | 2021-10-15 | 2022-01-11 | 晋能控股装备制造集团华昱能源化工山西有限责任公司 | Method for rapidly finding leakage and locking leakage valve |
| CN113916453B (en) * | 2021-10-15 | 2024-03-01 | 晋能控股装备制造集团华昱能源化工山西有限责任公司 | Method for quickly finding leakage and locking leakage valve |
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| CN104122037B (en) | 2016-12-07 |
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